﻿element { color: red }
element { color: #f00 }
element { color: #ff0000 }
element { color: rgb(255,0,0) }
element { color: rgb(100%, 0%, 0%) }
element { color: hsl(0, 100%, 50%) }

/* 50% translucent, support since Firefox 3 */
element { color: rgba(255, 0, 0, 0.5) } 
element { color: hsla(0, 100%, 50%, 0.5) }